Trident Trikes is the Distributor for Efneo GTRO Gearboxes in Europe.
The Efneo GTRO Gearbox is a 3 Speed Internally Geared Crankset Replacement. It will give you an effective gear range identical to having a 28/40/50 Triple Crankset up front, without having to use a front derailleur. You can shift the Efneo whether you are moving or standing still! The Efneo GTRO Gearbox comes in 3 different configurations- Twist Shifter, Trigger Shifter, or Bar End Shifter.